Facile hydrothermal synthesis and characterization of CoGeO/r-GO@C ternary nanocomposite as negative electrode for Li-ion batteries.

Ternary nanocomposite of CoGeO/r-GO@C is synthesized by single step hydrothermal method followed by calcination. The XRD analysis reveals the formation of cubic structured CoGeO and their corresponding functional groups identified through Raman analysis. The TEM analysis assures that uniform distribution of CoGeO nanoparticles on the r-GO layers. The Galvanostatic charge-discharge (GCD) curve demonstrates that the initial discharge capacity of pristine CoGeO, CoGeO/r-GO and CoGeO/r-GO@C composite is 1400, 1284 and 1594mAhg at 50mAg, respectively. The cycling stability curve shows the specific capacity of 609, 970 and 1180mAhg for pristine, CoGeO/r-GO and CoGeO/r-GO@C composite, respectively over 15 cycles. The ternary composite of CoGeO/r-GO@C delivers the discharge capacity of 323mAhg at high current density of 1Ag over 500 cycles with capacity retention of 71%. The rate capability curve indicates that CoGeO/r-GO@C composite shows the better rate capability.